POLI MP400 / MP400P

Confined Space Entry Monitors
The POLI multi-gas meters offer up to 6 gas monitoring of toxic gases, Oxygen (O2), Combustibles (LEL), Carbon Dioxide (CO2) and Volatile Organic Compounds (VOCs).

List of Benefits

  • Wide selection of "plug-and play" Smart Sensors (carry calibration data)
  • 4 Sensor slots for up to 6 gas measurements using combination sensor
  • 16-Hour rechargeable Li-ion battery (diffusion version)
  • Pump-off switch and low-power sensor options save battery for longer operation
  • 360-Degree LED alarm bar and Man-Down alarm
  • Flip screen
  • USB Micro charger & communications cable
  • Optional POLI MonoDock station for automated bump test and calibration
  • 6 Months continuous datalogging
  • Durable double shot outer case
  • Wireless remote team communication available (see mSquad & mPlatoon datasheets)
  • Mobile App for POLI simulation and training in smartphone or tablet


The POLI MP400P is an advanced model with built-in pump that allows a full selection of sensors for a wide range of applications, including Confined Space Entry, while the POLI MP400 is a diffusion, 4-6 gas detector for worker safety at hazardous locations. Smart sensors carry calibration information with them for quick exchange in the field during Hazmat or emergency response.

Specific sensors include electrochemical (EC) for Carbon Monoxide (CO), Hydrogen Sulfide (H2S), Ammonia (NH3), Hydrogen Cyanide (HCN), Hydrogen Chloride (HCl), Chlorine (Cl2), Chlorine Dioxide (ClO2), Nitric Oxide (NO), Nitrogen Dioxide (NO2), Sulfur Dioxide (SO2), Ethylene Oxide, Methyl Mercaptan (also known as Methanthiol) (CH4S), and others.

Also available are pellistor enables sensors for LEL level combustibles, non-dispersive infrared (NDIR) for Vol% level Carbon Dioxide (CO2) or Methane (CH4), and photo-ionization detector (PID) for PPM level VOCs. Use of combination CO/H2S or SO2/H2S and CH4/CO2 sensors allows up to 6 gas measurements in a single instrument. The MP400 / 400P has rugged construction and easy-to learn 2-button operation. The unique Man-Down alarm feature notifies team workers wirelessly if a user becomes incapacitated.

SpecificationDetail Description
Size140 x 84 x 42 mm
Weight435 g
SensorsOver 30 interchangeable and field-replaceable sensors including PID for VOCs, EC for Toxic and O2, Pellistor for LEL, and NDIR for LEL, Vol% & CO2
Response Time (t90)15 seconds (LEL/CO/H2S/O2), Others vary – see TA Note 4 at www.mpowerinc.com
Battery Rechargeable Li-ion pack 16 hours in diffusion mode, 12 hours with pump
Direct ReadoutReal-time reading of gas concentration, PID measurement gas and correction factor, Visual compliance indicator, Battery status, Datalogging on/off, STEL, TWA, peak and minimum values, Man-Down alarm on/off
Display128 x 128 graphical LCD, 1.77 x 1.73 in (45 x 44 mm), with LED backlight for enhanced readability. Automatic screen flip feature
Keypad2 Operation keys
SamplingBulit-in pump (MP400P) or diffusion (MP400)
CalibrationManual calibration or automated using POLI Docking Box. CaliCase option allows automatic bump test and calibration on up to 4 units simultaneously
AlarmsAudible (95 dB @ 30 cm), Visual (flashing bright red LEDs), Vibration, On-screen indication of alarm conditions, Man-Down alarm with pre-alarm, Panic Alarm (manual)
DataloggingContinuous datalogging (6 months for 4 sensors at 1-minute intervals, 24 hours/day and 7 days/week)
Charging and CommunicationCharging, data download, instrument setup and firmware upgrades on PC or laptop via PC comm, cradle, travel charger, or CaliCase.
Temperature-4° to 122°F (-20° to 50°C)
Humidity0% to 95% Relative humidity (non-condensing)
IP RatingIP-65 (pump versions); IP-67 (diffusion versions)
Safety CertificationsClass I, Div 1, Group ABCD T4, -20°C ≤ Tamb ≤ +50°C, IECEx Ex ia IIC T4 Ga, II 1G Ex ia IIC T4 Ga, European Conformity EMC/RFI EMC directive
Warranty2 Years on instruments, 2 Years on sensors for LEL, LEL/Vol, O2, CO, CO2, H2S, SO2, HCN, NO, NO2, and PH3, 1 Year on other sensors

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